There are differences between everyone’s genome, so when the human genome was mapped, who were they basing it off of?
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Currently a lot of peoples genomes have been mapped. The cost have come down to reasonable levels for research projects. So we are selecting interesting people to map the genome of as well as a lot of “standard” individuals. And we can compare the genome of a number of peolpe to get an average to compare against.
But if you are asking who was first, or at least who was first using a specific technique, that is a more interesting question. Firstly we have not actually mapped the full human genome. We are able to map most of the interesting sections just fine. However there are a number of repeating sequences in the genes which we can not map using current techniques. We are getting better at this though but this means that we do not have a single genome mapping project which can claim to be first. However it is typical for these projects to start with a sperm cell donated by an anonymous donor. Most likely from a sperm bank although there are plenty of ways to get voulenteer donors anonymously.
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